OPENDAP/olfs: Version 1.18.4 for Hyrax 1.15.4

OLFS version 1.18.4

OLFS 1.18.4 requires:

• BES Version 3.20.4
• libdap Version 3.20.3

• Added in mempory LRU cache for BES showNode responses. This is a performance enhancement. (HK-366)

• Added a site map cache file so that site maps for large instances of Hyrax(>500k datasets) can be navigated in a few seconds and not hours. (HK-375)

• Updated Docker containers so that Tomcat is producing compressed responses when the requesting client indicates that this is acceptable. (HK-329)

• Added response size logging to all metadata and data responses. Error responses do not have ssociated response size values in the log.

• Added missing code to support all DAP2/4 atomic numeric types in WCS-2.0 (HK-372)