[nhusers] NHibernate 5.1.0 released

[f***@free.fr]

NHibernate 5.1.0 is now released.

For a list of resolved issues & pull requests, see the milestone
<https://github.com/nhibernate/nhibernate-core/milestone/9?closed=1> or the
release notes
<https://github.com/nhibernate/nhibernate-core/blob/5.1.0/releasenotes.txt>.

Binaries are available on NuGet and SourceForge:
https://sourceforge.net/projects/nhibernate/files/NHibernate/5.1.0/
https://www.nuget.org/packages/NHibernate/5.1.0

##### Highlights #####
* NHibernate has gained two new target frameworks: .Net Core 2.0 and .Net
Standard 2.0. NHibernate NuGet package provides them, along with the .Net
framework 4.6.1 build.
For these new frameworks, some additional specificities or limitations
apply:
* Binary serialization is not supported - the user shall implement serialization
surrogates
<https://docs.microsoft.com/en-us/dotnet/api/system.runtime.serialization.iserializationsurrogate>
for System.Type, FieldInfo, PropertyInfo, MethodInfo, ConstructorInfo,
Delegate, etc.
* SqlClient, Odbc, Oledb drivers are converted to ReflectionBasedDriver
to avoid the extra dependencies.
* CallSessionContext uses a static AsyncLocal field to mimic the
CallContext behavior.
* System transactions (transaction scopes) are untested, due to the lack
of data providers supporting them.
* 114 issues were resolved in this release.

##### Possible Breaking Changes #####
* Since Ingres9Dialect is now supporting sequences, the enhanced-sequence
identifier generator will default to using a sequence instead of a table.
Revert to previous behavior by using its force_table_use parameter.
* Some overridable methods of the Dialect base class and of
MsSql2000Dialect have been obsoleted in favor of new methods. Dialects
implementors need to override the replacing methods if they were overriding
the obsolete ones, which are:
* Dialect.GetIfNotExistsCreateConstraint(Table table, string name),
replaced by GetIfNotExistsCreateConstraint(string catalog, string schema,
string table, string name).
* Dialect.GetIfNotExistsCreateConstraintEnd(Table table, string name),
replaced by GetIfNotExistsCreateConstraintEnd(string catalog, string
schema, string table, string name).
* Dialect.GetIfExistsDropConstraint(Table table, string name), replaced
by GetIfExistsDropConstraint(string catalog, string schema, string table,
string name).
* Dialect.GetIfExistsDropConstraintEnd(Table table, string name),
replaced by GetIfExistsDropConstraintEnd(string catalog, string schema,
string table, string name).
* MsSql2000Dialect.GetSelectExistingObject(string name, Table table),
replaced by GetSelectExistingObject(string catalog, string schema, string
table, string name).