gr_filter : Remove adaptive filter code.

This code has several coverity issues. Looking at the code showed no
in tree users, even in the in tree adaptive filters. Rather than try and
fix the issues here, or make the adaptive filters use this code. I
chose to remove the code. I also googled some and couldn't find public
users.

Resolves CID 1043256, 1046173 and 1046409.

Signed-off-by: Philip Balister <philip@balister.org>
digital: HPD fixes (burst ID tags are no more propagated; buffer sizes are halved to est. max output size)
modtool: bugfixes for in-tree operation (include paths, license, cmake editing)
volk: naming error between orc file name and kernel name.

Fixes bug #583.
volk: explicitly casting tolerance to float or unsigned int for passing to fcpmare or icompare in QA tests.

On ARMs, passing tol as a float to icompare that expects an unsigned int caused improper casting. Fixes bug #582.
blocks: loosen restriction on damping factor in control_loop class.
Merge branch 'maint'
digital: updated qa_mpsk_receiver to have similar tests in test01 and test02.

This is based of and should fix issue #569.
digital: on 32-bit machines when M=4 using single-precision float was causing k=1. Using double-precision calculation here to avoid possible confusion and errors
Merge branch 'maint'
qtgui: explicitly use this pointer in constructing validators. Support for older versions of QT.
blocks: fix pdu_to_tagged_stream when saving leftover items
Merge branch 'maint'
Merge remote-tracking branch 'balister/adap'
Merge remote-tracking branch 'martin/hpd-modtool-fixes' into maint
Merge branch 'maint'
grc: use dashed lines for message connections
digital: fix CID 1090058 and 1043272 in constellation
digital: Fix CID 1043268 and 1043271
Merge branch 'maint'