Debug build option

[justonedev1]

In case you need to debug something extensively in debugger and you can replicate the issue locally, you can now run

DEBUG=1 make

or

DEBUG=1 make WHAT=coconut

to create binaries with all the debug symbols and without optimizations (equivalent -O0 in gcc/clang) so you don't get those annoying problems while debugging like:

(dlv) args
timestamp = (unreadable could not find loclist entry at 0x7af03 for address 0xcd7634)
~r0 = (unreadable empty OP stack)