JuffEd 0.4 release

It's finally released!

The whole list of changes:
* Added: plugins support
* Added: autocomplete
* Added: printing
* Added: context menu for document tab
* Added: processing of read-only files
* Added: zoom in and zoom out (increase and decrease font)
* Improved: serach using regexps
* Fixed: now we have current file's directory at 'Save as' dialog
* Fixed: bug with repeated replacements if replacing text contains the replaceable one as a substring
* Fixed: restoring cursor position after reloading
* Added: RPM spec file
* Added: checking for g++ to configure file
* Added: highlighting for Batch files
* Moved PHP scheme out of HTML scheme (now it's a separate scheme)

Enjoy!