Apply maijin's patch honoring scr.color in axt/axf
Fix a lot of warnings for GCC

Less than 20 warnings remaining on my x86_64 GCC 4.9.1
Implement 'drr' to show debug register references (rfc)
Show only regs with size = asm.bits in drr
Fix 'axt' colors
add prefix repe
Fix stupid crash introduced in the previous commit
tiny improvements for r_io_desc_list
Colorize the pf help
Improve enum and bitfield names in pf

Remove the use of null char for non printable chars
English fix
Delete 'dsh', feature already implemented in 'dso'
Fix json output for enum, bitfield, char and byte
Fix json output