Convert seconds to human readable string(s)

Convert an amount of seconds to hours/days/weeks/etc.

This function converts a (usually large) amount of seconds to human-readable string. For example,
>> str = seconds2human(1463456.3)
str =
'About 2 weeks and 2 days.'
You may also call the function with a second input argument; either 'short' (the default) or 'full'. This determines the level of detail returned in the string:
>> str = seconds2human(1463456.3, 'full')
str =
'2 weeks, 2 days, 22 hours, 30 minutes, 56 seconds.'

The 'short' format returns only the two largest units of time.

Furthermore, [secs] may be an NxM-matrix, in which case the output is an NxM cell array of the corresponding strings.