Further support for concatenation expressions.

Now covers (and tests) the extra cases mentioned by Luis in his comment on issue #12.

The implementation of literal is a more complex than I'd like it, but I did so to be a bit more defensive. See the comments in the grammar for more detail.

git-svn-id: svn+ssh://svn.code.sf.net/p/koopa/code/trunk@154 07b9d407-957a-469a-9197-ae794bbef2a3
Issue #45 GUI-Bug: Clear all Results doesn't clear detail area

Fixed.

git-svn-id: svn+ssh://svn.code.sf.net/p/koopa/code/trunk@155 07b9d407-957a-469a-9197-ae794bbef2a3
Issue #36 Bug (Koopa GUI): Files in "Show-It mode" are opened in background.

Fixed.
Due to a NullPointerException.

git-svn-id: svn+ssh://svn.code.sf.net/p/koopa/code/trunk@156 07b9d407-957a-469a-9197-ae794bbef2a3
Issue #21 FR (GUI): Show summary of parsing in Overview window

Summary of batch parsing is now shown on the progress bar.

git-svn-id: svn+ssh://svn.code.sf.net/p/koopa/code/trunk@157 07b9d407-957a-469a-9197-ae794bbef2a3
Issue #5 FR for Show It: Add "search" and "go to line" 

Added basic search functionality. You can now "Find" (meta+F or ctrl+F) and "Find again" (meta+G or ctrl+G). For simplicity matches are case sensitive and search always wraps.

I had to update/disable accelerators for some other actions so that I could use the ones described above.

git-svn-id: svn+ssh://svn.code.sf.net/p/koopa/code/trunk@158 07b9d407-957a-469a-9197-ae794bbef2a3