add parameter to disable vertical alignment of condition symbol (#115)

[bertrandmartel]

According to #115, add parameters to symbol declaration with enclosed parenthesis and entries separated by = such as

cond1(param1=value1)=>condition: some condition

Also add parameter align-next used in condition symbol rendering to disable vertical alignment if needed

Example

cond1(align-next=no)=>condition: some condition
cond6(align-next=no)=>condition: another condition

If the parameter align-next is not specified, or if it doesn't hold no value, the default behavior is used