When specifying a const reference member variable in the constructor's initialization list, the argument must also be a const reference.
Make compilers happy by adding in a proper return instruction to the pycallback_object fall-through converter, even though it will never actually be issued.
Use LOG4CPP directories, not the library itself.
Fix abs block to work no matter the input type; addresses issue #660.
blocks: refactored stream_mux to be more flexible with buffer sizes
Use VERBATIM in custom commands to fix quoting, to make CMake happy with the Python command being issued
runtime: restoring sanity to pmt.is_blob()
filter: Adding filterbank_vcvcf, a filterbank where all taps are explicitly set.
fix numpy to pmt uvector conversion
filter: Adding hierarchical pfb channelizer.  Useful if pfb_channelizer is bottle-neck since it splits it into multiple blocks.
blocks: hide 'ignore tag' param for 'throttle' block in GRC if it's the default value (i.e. old look before param was added)
digital: added 'byte' IO format
blocks: added 'MTU' (buffer size) & 'no_delay' params to 'tcp_connection' (no longer uses fixed buffer)
blocks: added 'MTU' and 'tcp_no_delay' params for 'socket_pdu' (and GRC option), applied MTU (buffer size) to TCP/UDP send, separate TCP/UDP server endpoint resolvers for empty/0.0.0.0 Host param (listen on all interfaces)
Whitespace clean-up.
cmake: updated max ver for FindQwt to 6.2.0 (Qwt compiled direct from their source tree worked with trondeau's qt_number_sink test FG)
filter: Adding grc files and example for hierarchical pfb channelizer and generic filterbank.
filter: Remove debugging block from channelizer_hier_ccf.
made the usage of mt19937 Boost-pre-1.47 compatible

"correct" namespace is boost::random::, but mt19937 still exists in boost::, so
fixing this was just using the same name like in the other files that use
mt19937
Merge branch 'maint'
Merge remote-tracking branch 'michaelld/fix_clang_warnings' into maint