db: Change command-line options to be more UNIXy

[CarolineM]

The standard GNU style for command line arguments is to have long options be a word, or hyphen-separated words prefixed with two dashes, and short options be a single character prefixed with a single dash.

Here are my proposed new options:

-c, --commit The commit SHA1
-b, --branch The name of the Git branch
-r, --repo The Git repository
-p, --p2-version The P2 version
-m, --maven-version The Maven version
--project The project

[dlh3]

Consider using Apache commons-cli for the argument parsing. Though v1.3 is still snapshot, it's worth using. The API is much better with v1.3 than v1.2.

Used this recently, it makes defining and parsing arguments with both short- (-c) and long-forms (--commit) much easier than a homebrew approach.