osutil: eliminate alloca call
- make full_path a PATH_MAX + epsilon local buffer
- use strncpy and strncat
default = 'changelog'
feedupdated = '<updated>#date|rfc3339date#</updated>'
header = header.tmpl
changelog = changelog.tmpl
changelogentry = changelogentry.tmpl
filelog = filelog.tmpl
filelogentry = filelogentry.tmpl
tags = tags.tmpl
tagentry = tagentry.tmpl