specfile into the date, time and dataTime datatypes in XSD

even if module_name is specified or module_name and item_name are specified in arguments

it when responding the 404 status code due to the data error

nonexistent item name)

name or item name is incorrect

create a new exception StatsHttpdDataError which is an exception due
to the data specified to the stats daemon

 - change the relative path to the absolute path because in the case of the
   relative path refering to the other item is failed

 - The too long path is to be NotFound

 - change the condition of addition of anchor tag if depth levels of path are
   equal to or greater than 3, do not add the anchor tag.

the xsl:for-each tag)

- set minOccurs "0" if item_optional is True

- prepare table tag before going through list-type item

- use item_title instead of item_name if item_title is set

each item in XSL

This reverts commit a458d69d94b2a7506395e7a24e5c2a9146791553.