Add bit-level details for sequence files.
Add build files to gitignore

--BRJ
try-catch for linklist data in HDF5 file

--BRJ
Update makefile for latest msys2 build

Seems to be a compiler bug in std::vector with -Os and msys2 gcc 4.9.1
so comment out for now.
Update makefile for linux
Check error status in load_config()

--BRJ
Backport APS2 PLL and DAC setup to the APS1.

Important changes:

* calibrate VCO with 8 divider
* don't clear VCO cal flag on done
* set DAC controller clock divider
* no need to toggle the system oscillator when configuring the PLL.

--BRJ