Rename all demos to demo_foo / demo_foo.py

Registered by Anders Logg

To have uniform naming and simplify the linking from the online manual, all demos should be renamed according to the following naming scheme:

1. C++ demo executables named "demo_foo" (demo_poisson instead of poisson-demo)
2. Python demo scripts named "demo_foo.py" (demo_poisson.py instead of demo.py)

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Johannes Ring
Definition:
Approved
Series goal:
None
Implementation:
Implemented
Milestone target:
None
Started by
Johannes Ring
Completed by
Johannes Ring

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