[dev-context] i-columns.xml small correction

[Wolfgang Schuster]

Hans Hagen schrieb am 05.02.19 um 12:09:
> On 2/5/2019 11:51 AM, Taco Hoekwater wrote:
>> Hi,
>>
>> In the definition of “setupcolumns”, there are two cd:inherits
>> misrepresented as cd:constants:
>>
>>       <cd:parameter name="align">
>>        <cd:constant type="setupalign"/>
>>       </cd:parameter>
>>       <cd:parameter name="tolerance">
>>        <cd:constant type="setuptolerance"/>
>>       </cd:parameter>
>
> ok, i'll fix it

I have to change the definition of \startcolumns and \setupcolumns 
because the current descriptions is based on the old code.

The current version of the environment is based on the mixedcolumns code 
which has different options.

Wolfgang