Revert "Revert "Correction and comments""

This reverts commit f443cf8c17fa5d234451f5a9323a00d45ccf72d4.
Revert "Revert ".seg""

This reverts commit 04b6d407f858d08accbdfbc7a5c6dd7603a6b588.
Revert "Revert "original state of .gitignore""

This reverts commit f674e31195073511014941b2abd8e7b9e1c3b22e.
Revert "original state of .gitignore"

This reverts commit 14664cf81f186574043e067a414c39b923fb8ad8.
Revert ".seg"

This reverts commit 3f92523f4a3bfc99f7e647b98cd164380b59e50c.
Revert "Correction and comments"

This reverts commit 851ec866fcd496dd83ea7e10ac37bb829d9bb116.