Issue 1986 Checkpointing write & remove order change

[devrimcavusoglu]

Fixes #1986

Description: Former "remove & write" implementation order is reversed to "write & remove", api call has been added for ClearMLSaver remove functionality.

Check list:

• [ ] New tests are added (if a new feature is added)
• [x] New doc strings: description and/or example code are in RST format
• [ ] Documentation is updated (if required)

[vfdev-5]

@devrimcavusoglu thanks for the PR, i'll review it asap