feature request - favorites + more minor stuff

[itaybiancovonage]

there are 2 features from logexpert for instance which are sorely missed in glogg:

1. favorite filters - history is a good thing that exists, but favorites are really needed as well
2. tap on main view to move to closest line in filtered view

also, the tail view on MAC at least doesn't work very well, and just loads chunks of data every once in a while instead of doing a real on the fly tail.