Added configuration files for git and automatic formatting

.clang-format

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+BasedOnStyle: LLVM
+IndentWidth: 4
+UseTab: Never
+BreakBeforeBraces: Stroustrup
+AlignConsecutiveAssignments: true
+AlwaysBreakAfterReturnType: TopLevelDefinitions
+PointerAlignment: Left
+BreakBeforeBinaryOperators: None
+PenaltyBreakAssignment: 10000

.gitattributes

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+# Attribute file for Git to avoid superficial/invisible changes
+# caused by modifying the code with different text editors / operating systems
+# See https://help.github.com/en/articles/dealing-with-line-endings
+
+#Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Explicitly declare text files you want to always be normalized and converted
+# to native line endings on checkout.
+*.c text
+*.h text
+*.cu text
+*.cuh text
+*.txt text

.gitignore

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+asth-test.out.*
+*.pyc
+symb-test.out.*
+*.o
+DONE
+*.aux
+*.dvi
+*.log
+*.out
+*.swp
+*.tex~
+*.txt~
+*.bib~
+*eps-converted-to.pdf
+scripts/py_animate_data~
+scripts/py_compare_snapshot~
+scripts/py_show_ts~
+scripts/py_visual_data~
+*.blg
+*.spl
+makefile~
+*~