gr-filter: added CPPUNIT_INCLUDE_DIRS to lib/CMakeLists.txt
filter: safer values for QA tests for different machines.
filer: fixed link to libvolk.
filter: adding stdint.h fixes Fedora 17/GCC 4.7.0 build.
filter: adding set/get for phase of arb resampler.
filter: fixed bug with includes.
filter: added documentation to adaptive_filter blocks.
filter: improving documentation.
filter: improved QA code for fractional_interpolator and channel_model.
Setting various parameters in the channel model should already be checked by the QA code of the respective components since this is a hier_block2.
filter: fixed some include issues.
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