Add tags to entries

[boompig]

Overview

Enable entry tagging. Can either create user-specified tags or have the user choose from a static list. Can instead implement this as categories if simpler.

Purpose

Allow for better searching of entries. Right now entries are searched by 'account' only, and sometimes this is not rich enough. An user story where primitive search on 'account' would fail:

I manage many servers, each with their own password. I can't remember the hostname of this particular server, and I previously set the 'account' field as the hostname. Alternatively the hostname has changed. Alternatively, I made a typo during data entry.

How tags solve this issue:

In addition to specifying the account name, I tag the entry with "$MyCompany" and "server-login". Now during search I can filter all entries for just "$MyCompany" and "server-login".

[boompig]

This is not too convincing to me right now. I will revisit this if I can find a more compelling use-case, or if more users find this useful.