Various Warnings Produced

[zephyr5050]

Due to updates in Matplotlib and PyQt5, now various warnings crop up which don't hinder PyHammer's execution, but produce annoying command line warnings.

Some warnings experienced include the following:

DirectWrite: CreateFontFaceFromHDC() failed (Indicates an error in an input file such as a font file.) for QFontDef(Family="courier", pointsize=10, pixelsize=13, styleHint=5, weight=50, stretch=100, hintingPreference=0) LOGFONT("courier", lfWidth=0, lfHeight=-13) dpi=96

D:\Anaconda\lib\site-packages\matplotlib\cbook\deprecation.py:107: MatplotlibDeprecationWarning: Adding an axes using the same arguments as a previous axes currently reuses the earlier instance.  In a future version, a new instance will always be created and returned.  Meanwhile, this warning can be suppressed, and the future behavior ensured, by passing a unique label to each axes instance.
  warnings.warn(message, mplDeprecation, stacklevel=1)