Design cleanup
Fixes issue1828
more docstring fixes
Merge pull request #367 from timrichardson/issues/1864

fixed a bug in SQLFORM.grid where export would fail if a search filter a...
Merge pull request #368 from nicozanf/patch-1

Design cleanup
Merge pull request #369 from spametki/issue1828

Fixes issue1828
Merge pull request #370 from niphlod/docs/refactor_c_d_f_g_h

more docstring fixes
fixed issue 1862, readline problem in cpdb, thanks  kmelevskiy