simplify package.list.txt: Casing variants no longer needed

pkgs/package.list.txt

@@ -1,35 +1,23 @@
 # This file contains the mapping of directory names to package names for
 # documentation purposes. Each non-blank non-comment line is a two-element
-# list that says a possible name of directory (multiple lines may be needed
-# because of capitalization issues) and the documentation name of the package
-# to match. Pseudo-numeric suffixes are interpreted as version numbers.
+# list that says a possible name of directory and the documentation name of the
+# package to match. Pseudo-numeric suffixes are interpreted as version numbers.
 
 # [incr Tcl]
 itcl {[incr Tcl]}
-Itcl {[incr Tcl]}
 
 # SQLite
-Sqlite SQLite3
 sqlite SQLite3
-Sqlite3 SQLite3
 sqlite3 SQLite3
 
 # Thread
-Thread Thread
 thread Thread
 
 # Tcl Database Connectivity
 tdbc TDBC
-Tdbc TDBC
-TDBC TDBC
 # Drivers for TDBC
-Tdbcmysql	tdbc::mysql
 tdbcmysql	tdbc::mysql
-Tdbcodbc	tdbc::odbc
 tdbcodbc	tdbc::odbc
-Tdbcpostgres	tdbc::postgres
 tdbcpostgres	tdbc::postgres
-Tdbcsqlite3	tdbc::sqlite3
 tdbcsqlite3	tdbc::sqlite3
-Tdbcsqlite	tdbc::sqlite3
 tdbcsqlite	tdbc::sqlite3

tools/tcltk-man2html.tcl

@@ -538,8 +538,8 @@ array set remap_link_target {
     Tcl_Obj     Tcl_NewObj
     Tcl_ObjType Tcl_RegisterObjType
     Tcl_OpenFileChannelProc Tcl_FSOpenFileChannel
-    errorinfo 	env
-    errorcode 	env
+    errorinfo	env
+    errorcode	env
     tcl_pkgpath env
     Tcl_Command Tcl_CreateObjCommand
     Tcl_CmdProc Tcl_CreateObjCommand
@@ -714,7 +714,9 @@ try {
 		    if {[string trim $line] eq ""} continue
 		    if {[string match #* $line]} continue
 		    lassign $line dir name
-		    lappend packageDirNameMap $dir $name
+		    dict append packageDirNameMap [string tolower $dir] $name
+		    dict append packageDirNameMap [string toupper $dir] $name
+		    dict append packageDirNameMap [string totitle $dir] $name
 		}
 	    } finally {
 		close $f