Make CMake in-source builds a FATAL error.
Adding USE_TPIE CMake option for (the very few) people wanting the reproduce benchmarks with an old TPIE version. This removes a common warnings during CMake configuration for all others.
Fixing type conversion warning in MSVC.
Fixing warnings about uninitialized member variable.
Adding small entry on design of unordered_map/hash_map.
Updating compiler matrix in FAQ.
Updating CHANGELOG with minor changes.
Renaming btree tests to start with test_btree_.
Again updating compiler matrix.
Fixing file name header of renamed btree tests.
Removing done TODO items.
stxxl-1.4.1
Tagging trunk with unreleased 1.4-dev
Updating release instruction in some details.
Merge branch 'master' into HEAD