channels: adding grc definition for fading_model
qtgui: fixed duplication of time raster auto scale menu item.
qtgui: fixed a blank line issue in time raster plots.
qtgui: fixing time raster axis and picker labels.
Merge remote-tracking branch 'osh/next' into next
audio: fixed Windows typos
channels: adding simple QA for fading model. Doesn't really test much but that it runs.
channels: updating copyright year.
Merge branch 'master' of git://github.com/gnuradio/gnuradio into grmodtool
channels: adding GRC tone example
channels: fix for phase imbalance/alias in the specular component for Rician channels, switch phase accumulator to double precision, exporting step size to grcp
core: adding variance calcs to perf. counters.

Using running mean/variance algorithm from Knuth's Art of Computer Programming.
Merge branch 'master' into next

Conflicts:
	gnuradio-core/src/lib/runtime/gr_block.cc
	gnuradio-core/src/lib/runtime/gr_block.h
	gnuradio-core/src/lib/runtime/gr_block_detail.h
core: adding variance perf. counters to ctrlport.
core: adding new var perf. counters to swig interface.
core: Making an all C++ version of the preferences/config file readers.

This replaces the Python config parser stuff; should have same functionality that we need.
core: adding and using a PerfCounters section to the config files.

gr_block_executor will read the config files to determine if the perf counters are on or off.
core: only query preferences database once at start of block_executor.
core: add ability to override config files with environmental variables.

Env variables are named GR_CONF_<SECTION>_<OPTION> where the section is the [<section>] name from the config file and the option is the actual option name, all in upercase.
core: prefs of true/on/1 and false/off/0 are translated to bools.