Double precision PVQ: don't align the gain to the reference gain for noref
more dubious theoretical results
Moar doubt -- now illustrated
Fixes sign errors in the PVQ theoretical calculations
PVQ: moves synthesis part of pvq_theta() to pvq_synthesis()

Plus some more simplifications and comments to make the code easier to
understand (thanks to Sean Silva).
Update links to papers.

Some links were dead, and others missing.

Signed-off-by: Gregory Maxwell <greg@xiph.org>
[ci] Enable OD_CHECKASM and assertions and running the encoder.
Run ci scripts with -e so that failures aren't missed.
Fixing build problems with ci scripts.

Updated Makefile.am to include intradata_4x4.h, intradata_8x8.h and
 intradata_16x16.h.
Renamed intradata include files from .c to .h extensions.
Updating Makefile and intradata.c files for real.
[ci] autotools build should also do a non-distcheck build
Refactor motion vector input into separate function

This helps trim down `daala_decode_packet_in`.
No intended functionality change.

Signed-off-by: Timothy B. Terriberry <tterribe@xiph.org>