toxworkdir does not expanduser properly

Issue #327 on hold
Bixel Gitzenshigels
created an issue

I attempted to use a tilda in my toxworkdir as below within my tox.ini file:

toxworkdir = ~/.envs/tox/project_name/

However, much to my surprise, my tox was built under my project:

{toxinitdir}/~/.envs/tox/project_name