Merge pull request #91 from jwakely/missing-headers

Add missing QDataStream headers.

Correct activation of auto-search in a new tab.

Add caching of the position in CompressedLineStorage.

Re-activate compressed lines in memory.

Now share the indexing data between the two threads.

Compression is disabled.

Now copy the line position table between threads.

Temporary and very SLOW!

Optimise memory usage in the compressor.

Complete initial implementation of memory compression.

Implement compression of the memory for the index.

Refactor the LinePositionArray and add tests.

Make the performance monitor compile time optional.

Add a performance counter indicating the number of refresh per second.

Add missing QDataStream headers.

Remove open/close on each file access.

Performance is greatly improved:
sequentialRead 76.7s -> 9.8s
randomRead 15.7s -> 12.8s
browsingSearch 121s -> 29.8s

Avoid a division by zero in some edge cases where the file is truncated.

Activate auto-refresh when the checkbox is loaded from context.

Optimise searches when there is a lot of matches.

Add a perf test for searches.

Ensure path received from external commands are absolute.

Fixes #77

Minor adjustment for building on Win32.

Use the previous settings for auto-refresh and ignore case checkboxes.

Fix a build issue with Qt5.

Fix a bug: unable to shut down WatchTower...

... when an inaccessible dir has been added on Windows.

Bring glogg to the front on Windows as well.

Bring glogg to front when a new file is loaded from external signal.