Resolve "quit functions should not be called outside of try/except blocks"

Closes #92

See merge request !4

Merge branch '91-in-case-an-option-in-a-manifest-uses-a-type-which-is-not-allowed-the-error-message-is-highly-cryptic-and-doesn-t-help-to-solve-the-issue' into 'master'

Resolve "In case an option in a Manifest uses a type which is not allowed, the error message is highly cryptic and doesn't help to solve the issue"

Closes #91

See merge request !3

Resolve "--sufix command is a typo => rename to --suffix for proper english"

Closes #90

See merge request !2

Resolve "Add an option to display full error log in case of an error"

Closes #89

See merge request !1

Preliminary work to support a testsuite.

From Nick Brereton