Create an html table from icalendar data
ical2html [\,options\/] \,start duration \/[\,file\/]
-p, --class=\,CLASS\/
only (PUBLIC, CONFIDENTIAL, PRIVATE, NONE)
-P, --not-class=\,CLASS\/
exclude (PUBLIC, CONFIDENTIAL, PRIVATE, NONE)
-c, --category=\,CATEGORY\/
only events of this category
-C, --not-category=\,CATEGORY\/
exclude events of this category
-d, --description
include event's long description in a <PRE>
-f, --footer=\,TEXT\/
add text at the bottom of the HTML file
-z, --timezone=\,country\//city
adjust for this timezone (default: GMT)
start is of the form yyyymmdd, e.g., 20020927 (27 Sep 2002) duration is in days or weeks, e.g., P5W (5 weeks) or P60D (60 days) file is an iCalendar file, default is standard input