Improve the textbox function to preserve explicit newlines in the original text; includes an alternative to textwrap.wrap that does the same.
Improve the textbox function to preserve explicit newlines in the original text; includes an alternative to textwrap.wrap that does the same.

git-svn-id: 6d9763a5a770351123389058c013888add577529@14103 fe389314-cf27-0410-b35b-8c050e845b92

spacetelescope/stsci.tools