installation issue

[MaisieD]

• in setup.py, the name is still fracpy
• environment.yml failed to install
• missing the package tables in setup.py, or actually ptytables was commented away

[dboonz]

Re environment: I noticed that if I use mamba, not conda, everything works.
Re setup.py: Thanks for spotting it. That's been fixed now
We can turn on tables.py. On my work PC I have a better working version of environment.yml, I'll update it tomorrow.

[ShantanuKodgirwar]

Not sure if you updated the files, but I still had some issues. Just a small PR that fixes this, in case you guys want to merge it.