Add standard deviation error propagation

finish #2742
Remove base and simple average values

#2742
Add value formatter

#2742
Add equals for values, parses values from string

#2742
Add physical constant with standard deviation

#2742
Add physical constants formatter

#2742
Constants map

#2742
Fix round value

#2742
Fix formatter tests

#2742
Add constants providers, add C12 mass constant

#2742
Add reciprocal

#2753
Add internet socket address format factory

#2754
Fix physical constant tests
Update license headers
Add locale formatter

Because Locale#toLanguageTag() is only availabe in Java 1.7.
#2757
Byte value parse

Can format and parse bytes with unit multiplier: k, M, ..., Ki, Mi,...
#2762
Implement INI file parser

#2770
Implements section formatter

#2770
Add multi-line properties to parser

#2770
Create measure

Measure with a uncertain value and physical unit.