Handle MIN() formula expression

[kdinev]

Implement handling for a MIN() formula expression.

Requirements:

• MIN() should evaluate to a number
• MIN() should take as parameters a sequence of values, or value references
  • MIN(1, 2, 3) should yield 1
  • MIN(A1, A2, A3) should yield the minimum of the reference values in elements marked with the corresponding IDs, or data-ref attributes
• MIN() should take as parameters range of values or value references
  • MIN(1 : 3) should yield 1
  • MIN(A1 : A3) should yield the minimum of the reference values in elements marked with the corresponding IDs, or data-ref attributes