Use more POSIX-like syntax for regular expression bracket matching; Prevent searching backwards with a regex (unsupported); Scroll in view after the last replacement for replace all/selection. Also move hiding the replace dialog out of document.c

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@582 ea778897-0a13-0410-b9d1-a72fbfd435f5