basic utilities
vector begin
documentation, minor modifications
polygon start
mesh start
v_*compose, v_project..., use doubles
v_ux_uy..., v_rotate
polygon continuation
mesh continuation
minor corrections on vectors
p_rotate correction
p_draw
[mq]_draw
split mesh.[ch] into mesh.[ch] and quad.[ch]
Merge branch 'vector' into dev
Merge branch 'polygon' into dev
Merge branch 'mesh' into dev
v0.1 :trollface:

actually, nothing changed since the last commit :trollface:
minor corrections, NULL checks
minor refacts