remove autotools specific SUBDIRS
fix supported scenarios to no longer mention grub1
remove section handling from cmdline as grub2 do not allow specific section handling
remove unused variable skip_io
remove all notes about sections from documentation in bootloader client
default return tab is installation for grub2 and other bl we do not have
DRY code
simplify loader type widget as we now know only none, grub2 and grub2efi
loader type widget need not to be validated as we do not have sections tab now
remove memtest handling as it is now up to grub2
remove old handling of console for sections and keep only global one for grub2
update documentation
remove unused method blsection_types
remove unused variables for current_section
remove unused variable for removed sections
remove unused method read_default_section_name
remove unused method update_section_types
remove remapping of section attributes as it is not used
remove unused remapResume method
remove unused difflist method