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/ionization/ionization_analysis.py b/Examples/Modules/ionization/ionization_analysis.py
index b94541f90..f512eac6e 100755
--- a/Examples/Modules/ionization/ionization_analysis.py
+++ b/Examples/Modules/ionization/ionization_analysis.py
@@ -4,12 +4,12 @@
 This script tests the result of the ionization module in WarpX.
 
 Input files inputs.rt and inputs.bf.rt are used to reproduce the test from
-Chen, JCP, 2013, figure 2 (in the lab frame and in a boosted frame, 
+Chen, JCP, 2013, figure 2 (in the lab frame and in a boosted frame,
 respectively): a plane-wave laser pulse propagates through a
 uniform N2+ neutral plasma and further ionizes the Nitrogen atoms. This test
 checks that, after the laser went through the plasma, ~32% of Nitrogen
 ions are N5+, in agreement with theory from Chen's article.
-""" 
+"""
 
 import sys
 import yt