ANNOUNCE: doc on improving periods (books), lots, and unrealized gains out

[C. Gatzemeier]

From the docs and with your help on the list I refined the concept of books 
and lots as described under /src/doc and I think I could  solve the issues 
that were noted.

Some things that had issues before:

PERIODS:
   How to use "accounting periods" to support applying (multiple) accounting
   principles and optimize speed in larger data files.

LOTS:
   Allow transfering stocks to another brooker without breaking lots. Or
   making transactions in foreign denominated in currencies or moving to
   another country etc.

Additionaly it appears to me that a working implementation should actually be 
easier  than before.

Request for comments, wiki updates or patches ;-) 

The descriptions are available and editable at:
http://linuxwiki.de/GnuCash/DevelTexts

Enjoy!

Best regards,
Christian