Add option to customize db location

[greenmooseSE]

My home directory is on a GDrive path meaning GDrive locks the files now and then.
Anyhow I want to have my db at another place (e.g. c:/users), so it isn't constantly synced by google drive. It would be nice if this was feasible by e.g. setting an env.var ZLOCATION_DBPATH or similar.

Side note:
Code below caused index out of range error in dboperation function

 Write-Error $error[0]

Changing it to e.g. Write-Error ($error | select -first 1) voids the index out of range at least).

Thanks.

[vors]

great point, would you be able to send a Pull Request for the $error[0] thing?

Actually the customization of the db location path thru env var is also fairly straightforward. Would you like to hack this up? If you are up for it, but struggling, me or @theaquamarine always glad to help.