Support for range :select command

[gavynriebau]

I would find it useful if I was able to select ranges of lines using a command :select (or :sel for short) so that I can start editing them, here's an example of how I am picturing it would work:

• :sel 1-10 - Select lines 1 to 10 (inclusive)
• :sel 1-5,7-8 - Select lines 1 to 5 and 7 to 8
• :sel 7-$ - Select from lines 7 to the end of the file

For example to delete all but a small middle section of a large log file one could do :sel 1-856,900-$ followed by d.