- new feature: you can now specify the JVM heap size for the different
  app server profiles:

  fai_presentation_heap_size
  fai_editor_heap_size
  fai_analysis_heap_size
  fai_search_host

  If these are not specified, ece-install will use the
  default_app_server_heap_size, which is 2048MBs.

- added constant for the default app server JVM size

- added documentation of fai_presentation_heap_size
  fai_editor_heap_size fai_analysis_heap_size fai_search_host to the
  ece-install man page.