setup.py: fix python3 badness
fix usage of instanceStringWidthT1
convert paraparser to use  pyRXP directly (or any TT producer)
utils.py: add ascii_letters, ascii definition
changes to userguide code
docs: more fixes to userguide
attrmap.py: allow empty _attrmap attributes
markers.py: fix clone method and uSymbol tests
legends.py, stdparser.py: isSeqType-->isSeq
string module usage minimization
doctemplate.py: fix isinstance usage
utils.py, codecharts.py: add and use int2byte function
examples.py: range needs integers
xpreformatted.py:  add missing import
paragraph.py: move towards no decoding/encoding
attempt to remove old type testing
pdfdoc.py: fix missing isStr import
utils.py: added ascii_lowercase
test_source_chars.py: remove unwanted import
fix test_docstrings.py