Adding front-end option to compile Isca using single-precision (only working with Intel compilers)#265

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Commits on Apr 30, 2024

Adding codebase method to set compilation to single precision. This uses a combination of Iscas in-built macros with overload_c4 etc, whilst maintaining other default flags.
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Adding single-precision test case for Held-suarez.
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When compiling with alternative compile options a few errors were encountered with the simple cloud fortran files, which had missed a few file-exists imports from fms-mod. Also lcl.f90 explicitly d…
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Realised that -r8 option needs to be in mkmf template file for double precision, but should not be there for single precision. Do not currently have a dynamic way of editing that mkmf template file…
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Needs new env file to point to new mkmf file.
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