trivial changes to clean up the constitution

  * replaced all instances of 'COMSSA' with 'ComSSA',
  * clarify lists of criteria with 'any of' or 'all of',
  * removed reference to the non-existent 'Curtin Student Rules', and
  * made a variety of other grammatical corrections where necessary.
disambiguate the concept of a majority vote

There are many places where '50% + 1' is mentioned. For an example
committee of 9 members, this intuitively means 5 members. However,
'50% + 1' of 9 is 5.5, which is either 5 or 6 depending on rounding
strategy, and is 6 members given the common 'round half up' method.
removal of automatic membership for Computing students
changed membership fee to conform to Guild rules
allow all students studying for a Computing degree to bear office

The current rule which requires candidates to be studying a course
with over 50% credit points in Computing units excludes students
of double degree courses which yield a Computing degree, such as
132210 and 132010.

In the context of double degree courses, units belonging to each
constituent degree are not specified.

A simple addition of an alternative criterion such as 'studying a
course administered by the School of Electrical Engineering and
Computing' is no longer possible because most of the popular
Computing majors have moved to being under the purview of the School
of Science. A course whitelist is thus unfortunately necessary.
exec requirement changes
removed defunct club rego rules
we can not/do not do this anymore.
changed some committee eligibility rules.
changed membership length, ends at start of teaching year
we can charge members  for zero-cost events, probably good to have in as a protective measure
changed qouroum to be more flexible
grammar for last change
elected CSG OBs cannot evict members
we don't use any of this
start of formal policy section
more policy stuff
spelling
grammar
make things a little more clear