Add log_size configuration for checkpoints. #1170
Fix minimum value. #1170
Refactor to remove layering violations. #1170
Add log_printf call to ex_log.  Plus some fixes for it. #1171
Add more information and examples for the log cursors (a few bug fixes,
fix up the types in the examples, make sure we don't ignore any error
returns).
Log cursors are readonly period.
Fix a comment.
Merge branch 'develop' into log-printf
Merge branch 'log-printf' into log-printf-docs
Switch ex_log to the new develop branch's naming for home directories,
update the Makefile so "make clean" works.
Move step_count back out of conditional.  Fix example printing.
Merge branch 'develop' into log-printf
Add doc discussion about log_size. #1170
Merge pull request #1175 from wiredtiger/log-printf

Add log_printf call to ex_log.  Plus some fixes for it. #1171
Merge develop.
Merge pull request #1173 from wiredtiger/ckpt-log-size

Add log_size configuration for checkpoints. #1170