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* Suppress the problematic trap output in check_upg

The newly added trap, in systems where `rm` is aliased to `rm="rm -v"`,
shows a message stating that "update.lock" has been removed each time `zsh` is called.
I simply suppressed it with directing the output to `/dev/null`.

* Use `command` instead of >/dev/null to suppress

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

This early return made it so the lock wasn't removed, therefore locking out
the upgrade script from ever entering the upgrade routine.

Fixes #6138 

Note: the logic needs some rework.

`[Oh My Zsh] Would you like to check for updates? [Y/n]: ` does not make sense, 
since answering yes will download/apply the new updates instead of checking for them.

This makes things work even on system lacking /bin/sh, such as on
non-rooted Android systems.

Reverts #2296, but mostly #1883.

There is no need to source ~/.profile when this script is read. oh-my-zsh writes no configuration data in ~/.profile.

If the user wishes to use data within ~/.profile, then they should source it in another place.

Fixes #2315

Some environments (such as Android) does not have /usr/bin.

from #2360

Reverts #2296, but mostly #1883.

There is no need to source ~/.profile when this script is read. oh-my-zsh writes no configuration data in ~/.profile.

If the user wishes to use data within ~/.profile, then they should source it in another place.

Fixes #2315

Revert "Cancel update if the current user doesn't have write permissions for the oh-my-zsh directory."

This reverts commit 152e1e07.

Signed-off-by: Gaetan Semet <gaetan@xeberon.net>

auto-upadate feature will now reset the epoch so that if a user doesn't say yes, it won't ask them again for a while. fixes #1240

Fixes #549. Specify ZSH=$ZSH explicitly when invoking
the auto update scripts.

Paramater substitution instead of command subsitution was being used
causing the calculation of time since last check to be incorrect.

Updating check_for_upgrade script to fix issue when the LAST_EPOCH file/value got corrupted. Closes #32