Feature: search improvements

[k9ert]

fixes #1427

* Search for anything in the address, tx, label, confirmations or amount
* search like <code>%d.%m.%Y %H:%M</code> if you want to search in the time field
* <code> 1</code> for anything more than 1 BTC and likewise <code>< 1</code> (don't forget the space)

New is the tooltip, the case-insensitivity and that you can search for amounts bigger/smaller than some amount.

ToDo:
[ ] Fix wallets_api.py

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