comp_to_v4(): check ALL TYPE params for PREF

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

Merge pull request #1 from rsto/libicalvcard_fix_escaped_newline

libicalvcard: escape unescaped backslash at end of value

icalvalue: return "" for NO_VALUE if ALLOW_EMPTY_PROPERTIES=true

THANKS.md->CONTRIBUTORS.md define "Contributors to the Libical project"

Rename THANKS.md to CONTRIBUTORS.md and define what we mean by
"Contributors to the Libical project" for Copyright purposes.

THANKS.md->CONTRIBUTORS.md define "Contributors to the Libical project"

Rename THANKS.md to CONTRIBUTORS.md and define what we mean by
"Contributors to the Libical project" for Copyright purposes.