initial version of Profile78 support: make S.R.IS optional
adding tests: building FSharp.Core for Profile78
tests: building FSharp.Core for profile78
adjust condition so ReorderCompileItems is applicable only for netcore78 configuration
updated list of defines to include queries, added profile 259
moved error message to resources
update for appveyor build
add a version to appveyor
add appveyor build badge
Merge visualfsharp
Merge visualfsharp (2)
Merge visualfsharp (3)
make reference assemblies local, detect portable profiles
update CHANGES.txt
update CHANGES.txt
Unicode letters & operators

examples:
let ★ x = x + 5
let (|★) x y = x + y
let summ = ★ 5 |★ 5
comment about \So infix operators