fix offset; fix the corner case when laststridesize is smaller than stridesize

Fix offset calculation; VecView() writes two extra integers to file

polish the code a bit

fix runex20adj_20 wrong results; add some comments

TLTR works for all the four cases like a maigc!

!save_stack mode works for TLTR

save_stack mode works for TLTR

fix RevolveMultiStage; id must strat from 1

refactor two level framework; add second revolve object

change the structs to prepare for two level revolve

Begin renaming the PetscOptions objects for the future where PetscOptions will not be a singleton

fix the problem when compiling petsc without revolve

clean up macros

test without option --download-revolve

formatting

TLR scheme works

reorginize TLNR

fix bug in TLNR

multistage works

fix the problem with recompute()

two level without revolve works for all the four modes

revolve online and offline work with solution_only on and off

revolve online works

revolve online and offline work

fix test cases for checkpoiting