overlap bottom margin area of top element with top margin area of bottom element
XHTML_TAG_P in preferences
new properties in default styles css: margin-left, margin-right & text-indent
Regular text definition moved to styles.css

Conflicts:
	assets/default/styles.xml
formatting
synchronization with yota2 branch
no more styles in styles.xml
removed obsolete code
Merge branch 'master' into tags-master