Remove dialogs_show_goto_line(), use the more generic dialogs_show_input_numeric() instead.
Increase limit of the maximum line number from 99999 to 100000000.

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@3146 ea778897-0a13-0410-b9d1-a72fbfd435f5