Don' cherry-pick:

Don' cherry-pick:
- added more i18n strings (non-generic)
- receiptNumber may not be all-numbers, so changed type to java.lang.String
- removed p:message as this is no need for (anymore)
- incomeSingleAmount is now java.math.BigDecimal as this is more precise than
  java.lang.Float is
- having getter/setter for backing bean properties in interface may ask other
  developers to invoke them from other beans, this is bad as it may cause
  problems when code grows
- so the interface FinancialsIncomeWebRequestController is now cleared and all
  documentation is moved to backing bean class
- added itemNumber to same backing bean
- ADMIN_LINK_SHOW_RECEIPT_TITLE is a project-specific i18n key, not generic (msg)
- so ADMIN_LINK_SHOW_RECEIPT_ITEM_PRODUCT_TITLE is ...
- added missing navigation rules from admin_receipt_list
- fixed name for getter of filteredReceiptItems property
- renamed companyEmployee -> employee in JSF views/templates
- let's use beanHelper.renderBranchOffice() instead of outputting only plain id
  number
- added TODOs of unfinished/hard-coded stuff
- updated/changed copyright to Free Software Foundation

Signed-off-by: Roland Häder <roland@mxchange.org>