Added support for 'origin' when inserting timesteps
Added support for 'origin' when inserting timesteps

Insertion of timesteps at locations other than the end of the temporal topology is supported.

NOTE 1: Indexing of times after the insertion will change!!

NOTE 2: This is in-memory & pickle-persist support only and may not be fully supported with the initial implementation of the hdf5 persistence layer

ooici/coverage-model,ooici/coverage-model