small changes
- updated the doctoring for add_plotdata() to include 'marker' instead of 'm'
- added 'alpha' to bar charts (defaults.py)
set_legend()
- removed 'fontsize' this is a duplicate of 'size'
set_legend() fix
- legend font properties are now update
font updates
- removed 'style' and made sure all applicable functions have 'weight' to achieve bold face text
set_tick_params()
- changed docstring
- specifying 'both' as the axis results in strange results
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