codesearch: correct resource clean up #64
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The PR solves the following problems:
Cindex creates some temporary files during indexing, and a merge creates a ~ and ~~ index file. These temporary files are not cleaned up under Windows or the merge of the indexes fails. The reason for this is the incorrect release of mmap resources.
Furthermore, the Mmap slice is to small on large indices and a csearch fails.
The fixes of PR #34 are also included.
The .gitattributes file from Go has been adopted.
Fixed #50