ts->total_steps needs to be reset after recompute

fix pointer when freeing it

remove redundant declaration

first try to make the code more readable, compiles now

debugging 1

refactor code

fix trajbasic 2

fix trajbasic

add logevent in traj.c

fix conflict

Merge branch 'hongzh/checkpointing' of bitbucket.org:petsc/petsc into hongzh/checkpointing

Conflicts:
config/BuildSystem/config/packages/revolve.py
src/ts/trajectory/impls/basic/trajbasic.c

fix compile errors

merge nek-style checkpointing here mannually

refactor the code to prepare for all the three versions of revolve

fix brackets and names

remove some whitespaces

adjust the scope of revolve macro

revolve configuration works

use macro PETSC_HAVE_REVOLVE

remove revolve sources files from PETSc

skip the starting and ending step correctly

color output messages

Use global stepnum only in the forward sweep, not in the recomputations stage

use global stepnum, and fix error types

remove printf statements (for debug only)