[1D] Added a new log level for saving intermediate solutions
[1D] Added a new log level for saving intermediate solutions

Running Sim1D::solve with loglevel set to 7 or higher will now save the solution
after each attempted steady-state solution, after timestepping, and after
regridding to the file 'debug_sim1d.xml'. This can be useful for diagnosing
convergence issues with some problems.

git-svn-id: e76dbe14710aecee1ad27675521492cea2578c83@1957 02a645c2-efd0-11dd-984d-ab748d24aa7e

Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn,Cantera/cantera-svn