needs_transaction adjustments

I just moved the root path check out of needs_transaction, and put it directly
in pacman.c . I think this part is alright.

For the other problems, I thought about doing the transaction first, in a new
sync trans function, which will init and release a transaction.  And then doing
the commands like -Ss / -Sl / -Sg / -Si.

The problem is that for commands like -Sys / -Syl / etc, only the refresh part
of the transaction should be done.  So I had to introduce an ugly sync_only
hack.

Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

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