Extend selection

[jtorjo]

• allow extending selection up/down - by a period (in lines, and/or times)
• can have things such as "50" (50 lines up/down), "+20 -10" (20 down , 10 up), "+100ms -20" (100ms down, 20 lines up)
• have a "repeat last selection" hotkey that will just repeat the last extend selection
• have a special way to select things that happened "in the same period" - such as "in the same second", "in the same minute", "same hour", etc. - this is probably by not specifying +/-, like "1s" (+/- 1 second)
• I have to "explain" real time what the user has just typed (+1m = 1 minute down)
• the form - needs to have no border
• this has to be available as a right-click as well