Get correct install package name

[joshbax189]

This fixes a few bugs in install-file. Some of them are:

• can install from pacakge.tar and package.tar.gz
• ignore package.el metadata errors when installing (i.e. treat package-install-file like package-install)
• package name given to eask-package-install-file matches what package.el reports, so
  • packages in folders with different names install correctly, e.g. foo-0.0.1/foo-pkg.el

See extra tests cases in test/jest/install.test.js

[jcs090218]

Very nice! My first implementation was a bit lazy due to my busy schedule. 🥲 I appreciate you for taking care of this! 🚀🥳

[joshbax189]

No worries 👍

[jcs090218]

Merged! Thank you!! 😁