add: draw.cpp - refactored from .h only
add: -dflex switch (draw flexible path)
add: -wd and -d switch parameters for flexible warping windows
fix: incorect drawing of distance mininums in dtw matrices
fix: use of incorect length when calculatin startend limits for warping window (-w)
fix: crash when similarity marix was empty
update: CMakeLists, gitignore
other: various improvements and cleaning