Add support for update search in the Crawler.

Add checkbox for ignoring case and auto refreshing the search.

Correct update search on non LF terminated lines.

When an update search is made, glogg now re-search the last line in case
it has changed.

Build tests with optimisation and allow profiling.

Correct the handling of non-LF terminated files when data is added to them.

Add a test for this particular case.

Refactor LogDataWorkerThread to put the common code to the base class.

Implement the low level part of 'update' searches.

Refactored LogFilteredDataWorkerThread to handle "updating" searches.

No functionality added in this commit.

Correctly shows the final line if it doesn't end with LF.

Display "Searching" when QuickFind takes a long time.

Add notification when QuickFind reaches end/begin.

The notification is given in the QuickFindWidget that times out after
2s.

Search backward within a line when QF-ing backward.

Correct handling of lines containing tabs for QuickFind and double click selection.

Make partial selections return tab expanded strings.

Replace magic values for length of tab stop by a static variable.

Also remove disused common.h header file.

Update the getLength/getMaxLength functions to count expanded tabs.

Optimise line expanding.

Add new methods to AbstractLogData to expand tabs.

Works but slow, need optimisation.

Adjust the performance analysis script.

Minor corrections to docs, TODO and release script.

Release script doesn't store date in the .gz, making the same .gz every
time.

Update copyright information (add 2010).

Add line selection to the 'g' keyboard shortcut.

Display the current line number in the status bar.

Restore up and down icons in the filter dialog.

Correct a concurrent access bug in LogData.