Minor change to English.
Correct non existent link.
Add links to sections of the documentation where these are mentioned
in the text.
Modify English in autotagging section
Updated English in the Invocation section.
Updated English in the Pythonpath section.
Update English in GNU/Linux section.
UPdate English in the Error Handling section.
Update English in the archive files section.
Update English on HowTo use archive files.
Update English in Agenda Performance section.
Update English in SSD versus HDD section.
Update English in Power Consumption while on battery section.
Update English in Internals section.
Update English in FAQ files.
Some minor changes in the English.
Minor changes in the English.
Minor changes to the English.
Minor changes to the English.
Minor changes to the English.