Improve noexcept usage. (#997)

* Make `File::getName()` not noexcept.

It's likely not `noexcept`. Therefore, it would terminate when it
encounters an issue.

* Make `Selection::get*` not `noexcept`.

include/highfive/H5File.hpp

@@ -70,7 +70,7 @@ class File: public Object, public NodeTraits<File>, public AnnotateTraits<File>
     ///
     /// \brief Return the name of the file
     ///
-    const std::string& getName() const noexcept;
+    const std::string& getName() const;
 
 
     /// \brief Object path of a File is always "/"

include/highfive/H5Selection.hpp

@@ -30,21 +30,21 @@ class Selection: public SliceTraits<Selection> {
     /// \brief getSpace
     /// \return Dataspace associated with this selection
     ///
-    DataSpace getSpace() const noexcept;
+    DataSpace getSpace() const;
 
     ///
     /// \brief getMemSpace
     /// \return Dataspace associated with the memory representation of this
     /// selection
     ///
-    DataSpace getMemSpace() const noexcept;
+    DataSpace getMemSpace() const;
 
     ///
     /// \brief getDataSet
     /// \return parent dataset of this selection
     ///
-    DataSet& getDataset() noexcept;
-    const DataSet& getDataset() const noexcept;
+    DataSet& getDataset();
+    const DataSet& getDataset() const;
 
     ///
     /// \brief return the datatype of the selection

include/highfive/bits/H5File_misc.hpp

@@ -82,7 +82,7 @@ inline File::File(const std::string& filename,
     _hid = detail::h5f_create(filename.c_str(), createMode, fcpl, fapl);
 }
 
-inline const std::string& File::getName() const noexcept {
+inline const std::string& File::getName() const {
     if (_filename.empty()) {
         _filename = details::get_name([this](char* buffer, size_t length) {
             return detail::h5f_get_name(getId(), buffer, length);

include/highfive/bits/H5Selection_misc.hpp

@@ -17,19 +17,19 @@ inline Selection::Selection(const DataSpace& memspace,
     , _file_space(file_space)
     , _set(set) {}
 
-inline DataSpace Selection::getSpace() const noexcept {
+inline DataSpace Selection::getSpace() const {
     return _file_space;
 }
 
-inline DataSpace Selection::getMemSpace() const noexcept {
+inline DataSpace Selection::getMemSpace() const {
     return _mem_space;
 }
 
-inline DataSet& Selection::getDataset() noexcept {
+inline DataSet& Selection::getDataset() {
     return _set;
 }
 
-inline const DataSet& Selection::getDataset() const noexcept {
+inline const DataSet& Selection::getDataset() const {
     return _set;
 }