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Fix issue lscsoft/lalsuite#388

Closes #388

See merge request lscsoft/lalsuite!1471

- Newer Gawk (at least v5.1.0) will pre-compile the ratio
    ${peak_mem_sim_full} / ${peak_mem_no_sim}
  as a constant expression; if ${peak_mem_no_sim} == 0 this will then raise an
    awk: cmd. line:1: error: division by zero attempted
  error, even though the expression is never used as the if() condition is false
- Assigning those values to Gawk variables prevents the pre-compilation

Merge release branch

See merge request lscsoft/lalsuite!1468

Informative error message fRef NRwaveform

See merge request lscsoft/lalsuite!1462

Add fabs to prevent negative Spl2 and Smi2

See merge request lscsoft/lalsuite!1467