Added tests for copying a FmtStr with a new string and for inserting a string.
Fixed test for insert.
Working insert method for fmtstrs?
Created separate tests for inserting with an ending index and without.
Working insert method for fmtstrs with optional ending index argument?
Fixed issue where insertion did not retain attributes of component BaseFmtStrs.
fix unicode io
version bump
str_so_far wants strings, but was getting BaseFmtStrs; fixed now.
Insert method now ignores empty strings.
Made insert tests more rigorous; fixed test for copying with new string without changing attributes.
bust line cache on window size change
Fixed merge conflicts.
Merge branch 'immutability'
Removed old comments for splice method.