LSS Zone 1.2.0 alpha 5

New
- 'Internal Point Layer' command added to Layers toolbar and submenu
- code inside 'lss_zone_trace_cont.rb' commented in order to explain
tracing logic
- additional opening check added in order to handle situation when there
is no floor slab under door openings
- check for presense of the opening in traced openings array added (in
order to prevent openings duplication) duplication may take place if an
opening is framed by some geometry coincided with opening's boundary
- 'Settings' chapter added to 'Help System'
- 'Index' and 'Wat's New' pages of 'Help System' updated

Fixes
- zones list generator ignores now internal point mark while collecting
data about nested elements
- settings, which are related to contour tracing now added to
lss_zone_props.rb in order to handle distance data type properly
- opening trace offset attribute added to lss_zone_rebuild.rb
- LSS Zone Settings dialog's name changed to proper one (was just 'LSS
Zone')
- animation of images and thumbinals in 'Help' system now fixed for
'Chrome' (added support for HTML5 browsers 'naturalWidth',
'naturalHeight' properties of images being animated)