Qalculate! (GTK UI)

Changes:

• Add set functions (union, intersect, setdiff, setxor, isMember, isSubset) and operators (∪, ∩, ∖, ⊖, ∈, ⊆, etc.)
• Add characters(), count(), digitSum(), and digitalRoot(), find(), popCount(), string(), and while() functions
• Support negative row and column values in element(), row(), and column() functions
• Support matrix[row][column] syntax
• Support text objects in sort() function
• Add third optional argument to interval() function to allow exclusion of exact endpoints
• Ignore "to" and "where" (and equivalent symbols) inside quotation marks
• Ignore dot in front of plus or minus (for consistent behavior in line with entrywise operators)
• Show "Division by zero" warning for all divisions by zero
• Make display of expressions with time units in time format more consistent
• Fix parse status and calculate-as-you-type when "where" expression defines a new symbol
• Fix removal of currency symbol in immediately in front value when copying result without unit
• Fix support for vector in argument of many functions (erf, mod, exp, etc.)
• Fix explicit conversion to mixed units for year variants
• Fix first digit missing in return value of integerDigits() in some cases
• Fix segfault when Calculator object is destroyed with uninitialized random state
• Fix infinite loop when referencing subfunction in another subfunction
• Fix segfault in replace() with variable specified using where expression, e.g. "replace(v, x, 1) where v = x"
• Fix segfault when data set function name is followed immediately by a single dot
• Fix v[i]=a syntax for vector element assignment
• Convert degree Celsius to Fahrenheit and vice versa in Gnome search provider
• Minor bug fixes and feature enhancements