Empty is a transaction with no decls and no nested transactions.


git-svn-id: https://root.cern.ch/svn/root/trunk@49302 27541ba8-7e3a-0410-8455-c3a389f83636
Move resetting of the transaction in the transaction itself.


git-svn-id: https://root.cern.ch/svn/root/trunk@49303 27541ba8-7e3a-0410-8455-c3a389f83636
Changes:
- Consistent spelling Root, root -> ROOT
- Added bibliography and updated all citations
- epub: use --mathml (could use mathjax but have to include it)
- pdf: generate for A4.


git-svn-id: https://root.cern.ch/svn/root/trunk@49304 27541ba8-7e3a-0410-8455-c3a389f83636