add a bunch of stuff used by my backup program 'smir';

fix cursor position in the "shouldn't happen, but if it does, fall through to end-of-line case" case (`i=0` causes problems with the return values in this case)

Add @vurtun his nuklear library to Other Libraries

Change the usable language from C to C/C++

reduce time spent on global union-find by skipping clumps that don't touch edges

assign surplus adjacency storage only to clumps that touch edge
document timings and memory usage

document algorithm;
automatically use sqrt(N) instead of 32 as cluster size