Make allocation of cpus and threads dynamic

[mpaiao]

Description

This is an attempt to fix issue #436. Instead of hard coding the number of threads and cpus, we allocate them based on the information retrieved by the intrinsic functions.

Collaborators

@LMurphy186232 who identified the problem
@xiangtaoxu who provided initial feedback

Types of changes

• [] Hot fix (emergential bug fix to make ED2 run again)
• Bug fix (non-breaking change which fixes an issue) Issue Fortran runtime error: Index '143' of dimension 1 of array 'cpu_use' above upper bound of 64 #436
• New feature (non-breaking change which adds functionality)
• Other (fix or feature that would cause existing functionality to change)

Changes in Settings, Input Files or Output Files

• This feature requires changes in ED2IN
• This feature requires changes in the XML parameter file
• This feature requires changes in other input files
• This feature will change output files

Expectation of Answer Changes:

• No changes expected (bit-for-bit compatibility)
• Changes expected with specific configurations (see details below)
• Changes expected in all simulations (see details below)

Bit-for-bit compatibility when the number of cpus and number of threads is less than 64. Otherwise, this (hopefully) allows the code to run.

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• ED2 Wiki update:

Testing :

• All new and existing tests passed.

[LMurphy186232]

Don't merge this yet. It initializes thread_use and cpu_use before they are allocated, so OMP-enabled runs will crash.

[mpaiao]

Thanks @LMurphy186232! I made this very hastily, and it indeed needs testing.