Miscellaneous minor improvements

[slager]

Miscellaneous minor improvements:

• Alphabetize packages in DataPackageR's DESCRIPTION file using desc::
• cat a newline to the Logfile on first write if Logfile already exists.
  • This makes a nice visual separation between consecutive package rebuilds
• Remove a newline that was put into the Logfile mid-build
  • Now line breaks will indicate a different package_build attempt
• Remove an extra space in console informational output
• Simplify some calls to writeLines() including one that was an unnecessary tight loop
• No changes to functionality, minor UI improvements