Improve progress information

[otabuzzman]

Concept

• make console logger flush each line
• use INFO log level
• collect statistics in Peer class: count elements total in constructor, count processed elements in Peer#copyValues, consider differentiation of elements in D8N and those defined on the fly (e.g. Body elements by Catalog classes)
• enhance statistics with element name/ count map
• enhance Runner.sh to constantly update .inf file
• enhance /chart/{id} resource with statistics from .inf file
• enhance UI to display and update statistics while processing

Links

• Article about I/O redirection
• Article about sending stdout to multiple commands
• SO answer about constantly reading last line of file with bash

[otabuzzman]

Concept changed:

• do not enhance statistics with element name/ count map
• do not enhance Runner.sh to constantly update .inf file and
• do not enhance /chart/{id} resource with statistics from .inf file

but do

• enhance statistics with elements total/ processed
• constantly update DB and
• enhance /chart/{id} from DB
  respectively.

[otabuzzman]

• Split started state into generating and converting.
• Provide state info bar after confirming dialog on processing time. Pop-up info about values on hover.