Applying Lookbehind and Lookahead to replace (')
Applying Lookbehind and Lookahead to replace (')

Fixes the issue https://github.com/cubewise-code/tm1py/issues/202#issue-543913984

Changing re pattern from (?<!\()'(?!\)) to (?<=[A-Za-z])'(?=[A-Za-z])
Such only (') within strings are converted to ('')
OLAPLINE/TM1py