Exclude some more files from git control.

.gitignore

@@ -6,14 +6,20 @@ __pycache__
 
 *.egg
 *.egg-info
+.*cache*/
+*venv*/
 
 Cython/Compiler/*.c
 Cython/Plex/*.c
 Cython/Runtime/refnanny.c
 Cython/Tempita/*.c
 Cython/*.c
+Cython/*.html
+Cython/*/*.html
 
 Tools/*.elc
+Demos/*.html
+Demos/*/*.html
 
 /TEST_TMP/
 /build/
@@ -22,11 +28,16 @@ Tools/*.elc
 /dist/
 .gitrev
 .coverage
+*.patch
+*.diff
 *.orig
+*.prof
 *.rej
+*.log
 *.dep
 *.swp
 *~
+callgrind.out.*
 
 .ipynb_checkpoints
 docs/build