Update doc to include the version info of `since when'

Version section was getting confused to the API's availability,
 even though it was the version the doc was genereated.
So moving it into the footer and added @SINCE@ field in the data.

doc/fccache.fncs

@@ -74,6 +74,7 @@ FcCacheCopySet.
 @PURPOSE@
 This tries to clean up the cache directory of <parameter>cache_dir</parameter>.
 This returns FcTrue if the operation is successfully complete. otherwise FcFalse.
+@SINCE@		2.9.91
 @@
 
 @RET@		void
@@ -83,4 +84,5 @@ This returns FcTrue if the operation is successfully complete. otherwise FcFalse
 @DESC@
 This tries to create CACHEDIR.TAG file at the cache directory registered
 to <parameter>config</parameter>.
+@SINCE@		2.9.91
 @@

doc/fccharset.fncs

@@ -60,6 +60,7 @@ running out of memory.
 <function>FcCharSetDelChar</function> deletes a single Unicode char from the set,
 returning FcFalse on failure, either as a result of a constant set or from
 running out of memory.
+@SINCE@		2.9.0
 @@
 
 @RET@		FcCharSet *

doc/fcconfig.fncs

@@ -378,6 +378,7 @@ parse error, semantic error or allocation failure. Otherwise returns FcTrue.
 @PURPOSE@	Obtain the system root directory
 @DESC@
 Obtrains the system root directory in 'config' if available.
+@SINCE@		2.10.92
 @@
 
 @RET@		void
@@ -390,5 +391,6 @@ Set 'sysroot' as the system root directory. fontconfig prepend 'sysroot'
 to the cache directories in order to allow people to generate caches at
 the build time. Note that this causes changing current config. i.e.
 this function calls FcConfigSetCurrent() internally.
+@SINCE@		2.10.92
 @@
 

doc/fcdircache.fncs

@@ -62,6 +62,7 @@ FcDirCacheRead.
 @DESC@
 Re-scan directories only at <parameter>dir</parameter> and update the cache.
 returns NULL if failed.
+@SINCE@		2.11.1
 @@
 
 @RET@		FcCache *

doc/fcformat.fncs

@@ -305,4 +305,5 @@ For example, the format "%{family|downcase|delete( )}\n" will expand
 to the values of the family element in <parameter>pattern</parameter>,
 lower-cased and with spaces removed.
 
+@SINCE@		2.9.0
 @@

doc/fclangset.fncs

@@ -68,6 +68,7 @@ two or three letter language from ISO 639 and Tt is a territory from ISO
 <parameter>lang</parameter> should be of the form Ll-Tt where Ll is a
 two or three letter language from ISO 639 and Tt is a territory from ISO
 3166.
+@SINCE@		2.9.0
 @@
 
 @RET@		FcLangSet *
@@ -77,6 +78,7 @@ two or three letter language from ISO 639 and Tt is a territory from ISO
 @PURPOSE@	Add langsets
 @DESC@
 Returns a set including only those languages found in either <parameter>ls_a</parameter> or <parameter>ls_b</parameter>.
+@SINCE@		2.9.0
 @@
 
 @RET@		FcLangSet *
@@ -86,6 +88,7 @@ Returns a set including only those languages found in either <parameter>ls_a</pa
 @PURPOSE@	Subtract langsets
 @DESC@
 Returns a set including only those languages found in <parameter>ls_a</parameter> but not in <parameter>ls_b</parameter>.
+@SINCE@		2.9.0
 @@
 
 @RET@		FcLangResult
@@ -161,6 +164,8 @@ has no matching language, this function returns FcLangDifferentLang.
 Returns a string set of the default languages according to the environment variables on the system.
 This function looks for them in order of FC_LANG, LC_ALL, LC_CTYPE and LANG then.
 If there are no valid values in those environment variables, "en" will be set as fallback.
+@SINCE@		2.9.91
+@@
 
 @RET@		FcStrSet *
 @FUNC@		FcLangSetGetLangs
@@ -184,6 +189,7 @@ Returns a string set of all known languages.
 @PURPOSE@	Normalize the language string
 @DESC@
 Returns a string to make <parameter>lang</parameter> suitable on fontconfig.
+@SINCE@		2.10.91
 @@
 
 @RET@		const FcCharSet *

doc/fcstrset.fncs

@@ -104,6 +104,7 @@ Creates an iterator to list the strings in <parameter>set</parameter>.
 @PURPOSE@	get first string in iteration
 @DESC@
 Returns the first string in <parameter>list</parameter>.
+@SINCE@		2.11.0
 @@
 
 @RET@		FcChar8 *

doc/func.sgml

@@ -33,6 +33,7 @@
 	    <refentrytitle>@FUNC@</refentrytitle>
 @;@
 	    <manvolnum>3</manvolnum>
+	    <refmiscinfo class="software">Fontconfig &version;</refmiscinfo>
 	</refmeta>
 	<refnamediv>
 @{PROTOTYPE@
@@ -82,9 +83,9 @@
 @DESC@
 	    </para>
 	</refsect1>
-	<refsect1><title>Version</title>
+@?SINCE@
-	    <para>
+	<refsect1><title>Since</title>
-Fontconfig version &version;
+	    <para>version @SINCE@</para>
-	    </para>
 	</refsect1>
+@;@
     </refentry>