Now use floating-point for % diff in benchmark timing tables

gcpy/benchmark/modules/benchmark_gcclassic_scrape_timers.py
gcpy/benchmark/modules/benchmark_gchp_scrape_timers.py
- Changed the "% diff" column from exponential format (12.3e) to
  floating-point format (12.3f) to make it easier to see large
  differences

CHANGELOG.md
- Updated accordingly

Signed-off-by: Bob Yantosca <yantosca@seas.harvard.edu>

CHANGELOG.md

@@ -5,6 +5,9 @@ All notable changes to GCPy will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased] - TBD
+### Changed
+- Changed format of `% diff` column from `12.3e` to `12.3f` in benchmark timing tables 
+
 ### Fixed
 - Fixed formatting error in `.github/workflows/stale.yml` that caused the Mark Stale Issues action not to run
 - Added brackets around `exempt-issue-labels` list in `.github/workflows/stale.yml`

gcpy/benchmark/modules/benchmark_scrape_gcclassic_timers.py

@@ -180,7 +180,7 @@ def print_timer(key, ref, dev, ofile):
     pctdiff = np.nan
     if np.abs(ref[key] > 0.0):
         pctdiff = ((dev[key] - ref[key]) / ref[key]) * 100.0
-    line = f"{key:<22}  {ref[key]:>18.3f}  {dev[key]:>18.3f}   {pctdiff:>12.3e}"
+    line = f"{key:<22}  {ref[key]:>18.3f}  {dev[key]:>18.3f}   {pctdiff:>12.3f}"
     if np.abs(pctdiff) >= 10.0:  # Flag diffs > +/- 10%
         line += " *"
     print(line, file=ofile)

gcpy/benchmark/modules/benchmark_scrape_gchp_timers.py

@@ -256,7 +256,7 @@ def print_timer(key, ref, dev, ofile):
     if np.abs(ref[key] > 0.0):
         pctdiff = ((dev[key] - ref[key]) / ref[key]) * 100.0
     line = \
-        f"{label:<22}  {ref[key]:>18.3f}  {dev[key]:>18.3f}   {pctdiff:>12.3e}"
+        f"{label:<22}  {ref[key]:>18.3f}  {dev[key]:>18.3f}   {pctdiff:>12.3f}"
     if np.abs(pctdiff) >= 10.0:  # Flag diffs > +/- 10%
         line += " *"
     print(line, file=ofile)