[Bugs] #1701 URGE: Activity version: Add minor field

[Sugar Labs Bugs]

#1701: Activity version: Add minor field
----------------------------+-----------------------------------------------
    Reporter:  erikos       |          Owner:  tomeu            
        Type:  defect       |         Status:  new              
    Priority:  Urgent       |      Milestone:  0.88             
   Component:  sugar        |        Version:  Git as of bugdate
    Severity:  Unspecified  |       Keywords:  r?               
Distribution:  Unspecified  |   Status_field:  New              
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 Like discussed in the email thread we want to add a minor part to the
 activity version. The idea is to reuse the existing activity_version field
 as the major part (integer). A new field will be introduced that will be
 the minor part (fraction) of the new floating point activity version.

 Users before 0.88 will only see the major part and learners using a Sugar
 version >= 0.88 will see the minor part, too.

 The patch does the following:
 - a new field is added to the activity.info file (activity_minor_version)
 - internally the activity version will become represented as a float,
 constructing the value of the minor and major part if the minor part is
 available. Otherwise the activity version is converted to a float
 - when reading the favorites values from the config file the version is
 converted to a float, to make sure the values can be compared

 Testing:
 - add the minor part to an activity.info file of an activity
 - you should be able to change the favorite status in the activities list
 of new and old style activities
 - you should be able to install activities (check newer and older versions
 of the same activity, too)

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Ticket URL: <http://bugs.sugarlabs.org/ticket/1701>
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