Cleanup Forte (Spring 2021). Part 1 (evangelistalab#233)

* Delete attic and travis files

* Remove travis related files

* Add yapf style file

* Modify gitignore

* Move /src -> /forte

* Fix issues with new folder structure

* Add cmake file

* Specify folder in azure

* Fix path

* Fix test cases. Move deprecated C++ code to py side.

* Compile tests

* Minor cleanup

Author: fevangelista

.gitignore

@@ -6,7 +6,7 @@ Makefile.*
 Makefile
 timer.dat
 *~
-src/version.h
+forte/version.h
 
 # Qt Creator project files
 *.config
@@ -15,6 +15,9 @@ src/version.h
 *.files
 *.includes
 
+forte_tests
+forte_benchmarks
+
 # All outputs and clean files in test cases
 /tests/*/output.dat
 /tests/methods/*/output.dat
@@ -38,5 +41,6 @@ docs/sphinx/_*
 
 CMakeCache.txt
 CMakeFiles/
+forte/CMakeFiles
 cmake_install.cmake
 *.DS_Store

.style.yapf

@@ -0,0 +1,3 @@
+[style]
+based_on_style = facebook
+column_limit = 120