Source & Tools: No EOL Whitespaces

End-of-line (EOL) whitespaces are verbose and increase diffs and
merge conflicts over time.

Cleaned them up for the `Source/`, `Examples/` and `Tools/` directory
with the following bash one-liner:

```bash
find . -type f -not -path './.git*'  \
  -exec sed -i 's/[[:blank:]]*$//' {} \;
```

Committed as generic user so git does not credit the many lines
to me:
```bash
GIT_AUTHOR_NAME="Tools" GIT_AUTHOR_EMAIL="warpx@lbl.gov"  \
  git commit
```

1 files changed, 2 insertions, 2 deletions

diff --git a/Examples/Modules/RigidInjection/analysis_rigid_injection_LabFrame.py b/Examples/Modules/RigidInjection/analysis_rigid_injection_LabFrame.py
index 86214ad72..21bfcf945 100755
--- a/Examples/Modules/RigidInjection/analysis_rigid_injection_LabFrame.py
+++ b/Examples/Modules/RigidInjection/analysis_rigid_injection_LabFrame.py
@@ -23,7 +23,7 @@ filename = sys.argv[1]
 
 # WarpX headers include more data when rigid injection is used,
 # which gives an error with the last yt release.
-# To avoid this issue, the three last lines of WarpXHeader are removed if 
+# To avoid this issue, the three last lines of WarpXHeader are removed if
 # needed.
 def remove_rigid_lines(plotfile, nlines_if_rigid):
     header_name = plotfile + '/WarpXHeader'
@@ -32,7 +32,7 @@ def remove_rigid_lines(plotfile, nlines_if_rigid):
     nlines = len(file_lines)
     f.close()
     if nlines == nlines_if_rigid:
-        f = open(header_name, 'w')        
+        f = open(header_name, 'w')
         f.writelines(file_lines[:-3])
         f.close()