yawa.c: handle flips
yawa.c: Exit with -2 on bad colors
yawa.c: Remove remains of old argument parsing
rename setRootAtoms to set_root_atoms to fit other names
parse_color: Use bool return-type, nuke PColor for Color*
Handle all arguments, split out int parsing function
Move parse_color to utils.c
yawa.h: Move argp variables to yawa.c
Remove space before function names
Make non-negatable arguments unsigned, make parse_uint
use ‘signed’ instead of ‘int’, redo prototypes

The flip arguments are implemented so delete comment
struct: ‘unsigned int’ → ‘unsigned’, ‘int’ → ‘signed’
Opening curl braces should be on the same line
Implement functionality part of --write argument
Add parse_double function to utils.c
replace all int with signed, unsigned int with unsigned
Fix alpha, blur, sharpen, constast, brightness, and gamma switches
Add replacement for -addd using --add and --distance

To overrife the nth distance you need n number of --distance flags,
distance defaulting to 1 for each color.
Drop short opts for flips
README: add feature-complete note