more parameters for file paths

EzpName, EzpURL & HTMLHead

body parsing better for response

no functional changes from v4

AUTH_INSECURE_TLS introduced

Formerly, if json body was used with digest, on gerrit, Content Type was complained.
So digest lib is switched.

all errors in lower case

ShowByteln() shows better

Accept and Content-Type can be set for REST/HTTP requests
by parameters instead of automatically added
AUTH_NONE will not add auth info in REST requests

to enable file read in chunks with ReadCloser

to read files piece by piece

existing FileWrite() overwrites files

to show caller of Log*

log of Go by default
null pointer protection for I18n

LoadLanguage() returns language so that zero input can know the detected one

644->755 so that its content can be visited.

directory created for FileWrite()
system config directory supported for XML*Default()

Log*() reorganized
GetCaller() added

CanStaticMap corrected when quantity equals max configured

mainly related to sorting