smtk::mesh::Collection now has a modified flag.

The modified flag for a mesh collection represents that underlying mesh
database representation has changed such that a write would generate a file
that would not be byte equivalent to the input file.

In the case of mesh databases that are generated in-memory, the modified
flag is set to be true once the first mesh element is added to the database.
22 jobs for add_isModified_flag_to_smtk_mesh
Status Job ID Name Coverage
  External
passed cdash

passed kwrobot-branch-check

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failed smtk-endor-linux-shared-relwithdebinfo