Mastodawn

I'm pleased to announce hledger 2.0 preview release 3!

Highlights:
- conventional file layout for rules/data/prices
- get command
- commodity aliases
- print aligns by decimal mark
- more intuitive precision behaviour
- more robust lot detection
- average cost basis methods
- customisable report titles
- prices --summary report
- a more robust roi report
- and many other improvements and fixes.